Engineering thermodynamics

Performance and Sizes of sCO2 Multistage Axial Compressors at Various Power Capacities

  • WANG Tianze ,
  • XU Jinliang ,
  • ZHENG Haonan ,
  • QI Jianhui
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  • 1. Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 100026, China
    2. Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University), Ministry of Education, Beijing 102206, China
    3. School of Energy and Power Engineering, Shandong University, Ji’nan 250061, China

Online published: 2025-03-04

Supported by

This work was supported by the Natural Science Foundation of China (52130608, 51821004).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

Abstract

The supercritical carbon dioxide (sCO2) cycle can be powered by traditional as well as clean energy. To help users obtain more accurate results than the literatures with pre-set compressor efficiency, we proposed a complete model to establish a link between the performance, sizes of compressors and parameters such as power WC, inlet temperature Tin, inlet pressure Pin and pressure ratio ɛ. Characteristic sizes of compressors lc, profile loss Yp and clearance loss Ycl are all proportional to powers of WC with powers of 0.5, –0.075 and –0.5 to 0 respectively; the scaling laws are constant in the range of capacities from 20 MW to 200 MW. The compressor isentropic efficiency ηtt grows as the WC increases, and the curves become gentle. Compressor efficiency improves over the full power range when the speed is changed from standard speed to the optimal speed; the ηtt curves turn soft as the n increase. As the Pin and Tin approach the critical point, the ηtt increase. Compressor efficiency follows a parabolic curve as the ɛ increases, this parabolic distribution results from the tradeoff between the change in losses and the pressure distribution of blades. The ηtt versus Pin, Tin and ɛ relations are similar at various capacities because of insignificant changes in the distribution of losses. Compressor efficiency maps facilitate the estimation of system performance, while scaling law for irreversible losses and characteristic lengths, along with constant criterion analyses, aid in comprehending the characteristics of compressors across various capacities.

Cite this article

WANG Tianze , XU Jinliang , ZHENG Haonan , QI Jianhui . Performance and Sizes of sCO2 Multistage Axial Compressors at Various Power Capacities[J]. Journal of Thermal Science, 2025 , 34(2) : 352 -373 . DOI: 10.1007/s11630-025-2091-8

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